/*
 * F22 Junior Design System Implementation
 * Role: The design system implementation.
 */

:root {
  /* Color Palette - Night/Graphite/Cobalt/Signal Orange & Frost/Ink */
  --color-night: #07111F;
  --color-graphite: #101D2D;
  --color-text-primary: #F4F7FB;
  --color-text-secondary: #A8B6C8;
  --color-accent-cobalt: #2F80FF;
  /* Darkened cobalt for WCAG-AA compliance on primary buttons (white text) */
  --color-accent-cobalt-dark: #1A56C9; 
  --color-accent-orange: #FF9A3D;
  --color-border: #263A52;
  --color-frost: #EDF3F8;
  --color-ink: #0B1726;

  /* Typography Scales */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;

  --fs-h1: clamp(2rem, 5vw, 3.5rem);
  --fs-h2: clamp(1.5rem, 4vw, 2.25rem);
  --fs-h3: 1.5rem;
  --fs-body: 1.0625rem; /* ~17px */
  --fs-small: 0.875rem;
  --fs-label: 0.75rem;

  --line-height-heading: 1.1;
  --line-height-body: 1.6;
  --line-height-tight: 1.2;

  /* Spacing & Layout */
  --container-max-width: 1200px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-night);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-accent-cobalt);
  color: white;
  padding: var(--space-sm) var(--space-md);
  z-index: 1000;
  text-decoration: none;
  font-weight: bold;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-accent-orange);
  outline-offset: -3px;
}

/* Accessibility: Focus States */
:focus-visible {
  outline: 2px solid var(--color-accent-cobalt);
  outline-offset: 4px;
}

img {
  max-width: 100%;
  display: block;
  height: auto;
}

a {
  color: inherit; 
  text-decoration: none; 
  transition: color var(--transition-fast);
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* --- Layout Components --- */
.container {
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: 24px; /* Mobile gutters (20-24px) */
}

@media (min-width: 768px) {
  .container {
    padding-inline: 0;
  }
}

.grid {
  display: grid;
  gap: var(--space-md);
}

/* Header & Nav */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(7, 17, 31, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.25rem;
}

.brand-logo {
  height: 32px;
  width: auto;
}

#main-nav ul {
  display: flex;
  gap: var(--space-md);
}

#main-nav a {
  font-size: var(--fs-small);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  font-weight: 600;
}

#main-nav a:hover, 
#main-nav a[aria-current='page'] {
  color: var(--color-accent-cobalt);
}

/* Mobile Nav Toggle */
#nav-toggle {
  display: none; /* Hidden on desktop by default */
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 8px;
  z-index: 101;
  min-width: 44px; /* Touch target requirement */
  min-height: 44px;
}

.hamburger-box, .hamburger-inner, .hamburger-inner::before, .hamburger-inner::after {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  display: block;
  transition: transform var(--transition-fast) ease;
}

.hamburger-inner { position: relative; }
.hamburger-inner::before, .hamburger-inner::after {
  content: "";
  position: absolute;
  left: 0;
}
.hamburger-inner::before { top: -8px; }
.hamburger-inner::after { bottom: -8px; }

[aria-expanded="true"] .hamburger-box {
  opacity: 0;
}
[aria-expanded="true"] .hamburger-inner {
  transform: rotate(45deg);
  background-color: transparent;
}
[aria-expanded="true"] .hamburger-inner::before { transform: rotate(-45deg) translate(12px, -8px); }
[aria-expanded="true"] .hamburger-inner::after { transform: rotate(45deg) translate(12px, 8px); }

/* --- Typography & Content --- */
h1 {
  font-size: var(--fs-h1);
  line-height: var(--line-height-heading);
  margin-bottom: var(--space-sm);
}

h2 { font-size: var(--fs-h2); margin-bottom: var(--space-md); }
h3 { font-size: var(--fs-h3); margin-bottom: var(--space-sm); }
p { margin-bottom: var(--space-md); color: var(--color-text-secondary); }

.label {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-cobalt);
  display: block;
  margin-bottom: var(--space-xs);
}

/* --- Components --- */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center; 
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  font-size: var(--fs-small);
}

.btn--primary {
  background-color: var(--color-accent-cobalt-dark); /* Darker for 4.5:1 contrast with white */
  color: #FFFFFF;
  border: 1px solid var(--color-accent-cobalt-dark);
}

.btn--primary:hover {
  background-color: var(--color-accent-cobalt);
  transform: translateY(-2px);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  background-color: var(--color-graphite);
  border-color: var(--color-accent-cobalt);
}

/* Status Pills / Tags */
.pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 100px;
  font-size: 10px; 
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-border);
  color: var(--color-text-primary);
}

.pill--status {
  padding: 4px 12px;
  font-size: 11px;
  border: 1px solid transparent;
}

/* Utility class for status pills to avoid inline styles */
.pill--status-block {
  display: block;
  width: fit-content;
  margin-bottom: var(--space-sm);
}

/* Cards */
.card {
  background-color: var(--color-graphite);
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  border-radius: 8px;
  height: 100%;
}

.card--feature {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.card--accent-left {
  border-left: 4px solid var(--color-accent-cobalt);
}

/* Form Elements */
.form-container {
  max-width: 600px;
  margin: 0 auto;
}

.field-group {
  margin-bottom: var(--space-md);
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.help-text {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  display: block;
  margin-top: 4px;
  margin-bottom: 12px;
}

input, textarea {
  width: 100%;
  padding: 0.75rem; 
  background-color: var(--color-night);
  border: 1px solid var(--color-border);
  color: white;
  font-family: inherit;
  border-radius: 4px;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--color-accent-cobalt);
}

/* Form Validation Styles */
.error-summary {
  background-color: #FEE2E2;
  border: 1px solid #EF4444;
  color: #B91C1C;
  padding: var(--space-sm);
  margin-bottom: var(--space-md);
  border-radius: 4px;
}

input.is-invalid {
  border-color: #EF4444;
}

.error-msg {
  color: #FF5C5C;
  font-size: var(--fs-small);
  margin-top: 4px;
  display: block;
}

/* Disclosure Panel */
.disclosure {
  background-color: var(--color-frost);
  color: var(--color-ink); /* High contrast for light sections */
  padding: var(--space-md);
  border-radius: 8px;
  font-size: var(--fs-small);
  margin-top: var(--space-lg);
}

/* --- View Specifics (Layout Helpers) --- */
.hero {
  display: grid;
  grid-template-columns: 1fr; 
  align-items: center;
  gap: var(--space-xl); 
  padding: var(--space-lg) 0;
}

.hero__content {
  z-index: 2;
}

.hero__image-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
  border-radius: 8px;
}

/* Utility Classes */
.hero__actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.img-card {
  width: 100%;
  border-radius: 4px;
  margin-bottom: var(--space-lg);
  display: block;
}

.bio-list { margin-bottom: var(--space-lg); }
.principles-item { margin-bottom: var(--space-md); }
.chapter-card {
  background-color: var(--color-frost);
  color: var(--color-ink);
}
.disclosure-text { font-size: var(--fs-small); margin: 0; }

.contact-success {
  display: none;
}
.contact-success.is-visible {
  display: block;
}

/* --- Footer --- */
#site-footer {
  margin-top: var(--space-xl);
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  font-size: var(--fs-small);
}

.footer-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
  text-align: center;
}

/* --- Responsive Design --- */
@media (min-width: 768px) {
  .hero {
    grid-template-columns: 1fr 1fr;
    padding: var(--space-xl) 0;
  }

  #nav-toggle { display: none; }
  
  #main-nav {
    display: block !important;
  }

  .footer-wrapper {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  #nav-toggle {
    display: block;
  }

  #main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-graphite);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md);
  }

  #main-nav[aria-expanded="true"] {
    display: block !important;
  }

  #main-nav ul {
    flex-direction: column;
    gap: var(--space-sm);
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-lg { margin-top: var(--space-lg); }
.mb-lg { margin-bottom: var(--space-lg); }

.disclosure p, 
.card--light p, .chapter-card p {
  color: var(--color-ink);
}

.footer-disclosure-extra {
  margin-top: var(--space-lg);
}

/* Landing hero alignment fixes */
main#app > section.hero .hero__content {
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: 24px;
}

@media (min-width: 1024px) {
  main#app > section.hero .hero__content {
    padding-inline: 0;
  }
}

@media (min-width: 1024px) {
  main#app > section.hero {
    max-width: var(--container-max-width);
    margin-inline: auto;
  }
}